Electrode for electrolyzers used in the manufacture of bleaching liquors.



. PATENTED- DEC. 5, 1905.- R. K'OTHER.

ELECTRODE FOR ELEQTROLYZERS USED IN THE MANUFAGTURE 0P BLEAGHING LIQUORSL APPLICATION FILED BBPT.'7, 1906.

' [Iii enter: awn/M0 'f NITED. srAT s RIOHARDIIKOTHER, or OUNEWALDE, GERMANY, ASSIGNOR or ONE-HALF TO CHARLES EDWARD WAITHMAN cannon, or MONTFORD, COUNTY OF CHESTER, EN GLAND.

ELECTRODE FOR ELECTROLYZERS USED IN THE MANUFACTURE OF BLEACHING LlQUORS.

such as used in sodium-chlorid lectrolyzersfor producing bleaching liquors. The manufacture of these apparatus provided with electrodes which keep active for a number of years is very expensive in consequence of the high price of the platinum element, which solely is capable of being used for. producing bleaching liquors containing chlorin, that very often instead of platinunqgraphitecarbon is used for making the electrodes,which carbon,

howeveiywhen used as an anode wears away 1n a comparatively short time.

cheaper manner, still using platinum for the electrodes, and to do away with the drawbacks arising in the so-far-known apparatus-- such drawbacks being, for instance, the wearing away of the carbon electrodes-the platinum is according to the present invention laid or folded across an insulator either in the form of thin layers or a thin wire-netting in such a manner that the platinum representing the anode covers the insulator entirely on one side and-is also folded round the edge of the same. This insulator is then-secured to the element acting as cathode and composed of a plate or rod of graphite carbon or other suitable material in a manner to obtain a connection between the platinum acting as the anode and the carbon or other suitable material acting as the cathode without any loss of voltage.

The plates or rods ofgraphite carbon may be separated by a non-conducting partition of Specification of Letters Patent.

Application filed $eptem'ber 7, 1905- Qrial No. 277,463.

To be able, therefore, to manufacture such apparatus in a lating protecting-plate and the latter covered with platinum in the shape of a thin platinum .foil or a wire-netting. As already stated, instead of the plate. of graphite carbon a plate of any other suitable and corresponding material or rods of any suitable shape may be used.

In the accompanying drawings various examples of the sented. 1

Figure 1 shows in an elevation the mode of fastening a platinum foil on a non-conducting plate fastened to a plate of graphite carbon. Fig. 2 is a cross-section, and Fig. 3 a horizontal section of the electrodes. Fig. 4 shows the arrangement of the electrode according to the present invention in an electrolyzer, and Figs. 5 and 6 show in elevation and cross- Pate nted Dec. 5, 1905. A

present invention are repre-.

section a form of construction in which the platinum in the shape of a wire-netting is fas-. tened to a non-conductor and to the graphite lating-plate is only partly covered by plati num through the same having been bent round the edges of the insulator, whereby the'platinum only acts as conducting material. Against this latter side a plate of graphite carbon 0 is attached and pressed-for example, by screws ,cZ vor the like-whereby the passage of the cumrent from platinum to graphite carbon is-obtained without loss of voltage. The use of an of platinum were directly secured to the plate of graphite carbon, the platinum layer would have to be made entirely without holes in order to prevent a destruction of the graphite plates. In this case the platinum foils would have to be used representing at least a thickness of one twenty-fifth of a millimeter, as only by using such sizes can thin layers with certainty be obtained Without holes.

In Figs. 5 and 6 the platinum a is fastened in the shape of a thin platinum net to the insulator Z) to increase as much as possible the acting surface of the platinum.

What I claim is v 1. In an electrode for use in electrolyzers for producing bleaching liquids, a plate of suitable non-conducting material, a very thin anode element laid on the face of and over edges of the insulating-plate, an element acting as cathode, and means for holding the cathode element in close contact with the turned edges of the anode element.

2. In an electrode for use in electrolyzers for producing bleaching liquids, a plate of suitable non-conducting material, a very thin sheet of platinum laid on the face and over edges of the insulating-plate, an element acting as cathode, and means for pressing the cathode element against the turned edges of the anode at the back of the insulating-plate.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 24th day of August.

RICHARD KOTHER.

Witnesses:

PAUL ARRAS, GEoRe RICHTER. 

